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As noted by UC Berkeley, although ultraviolet rays can degrade cigarettes into smaller particles, toxic substances like formaldehyde, arsenic and polyaromatic hydrocarbons (PAHS) will never break down

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At the time I was working on vaporisation by ultrasound, but the droplets formed were too big to resemble tobacco smoke.[34] The challenge was radically reducing the size of the mechanism to fit into a hand-held cigarette-sized device, getting the right dose of nicotine in a form that resembled smoke, while also getting the right odours from harmless additives